public void PopulateAssignedCategoryData(Vaida_Sabina_ProiectContext context, Album album) { var allCategories = context.Category; var albumCategories = new HashSet <int>(album.AlbumCategories.Select(c => c.AlbumID)); this.AssignedCategoryDataList = new List <AssignedCategoryData>(); foreach (var cat in allCategories) { AssignedCategoryDataList.Add(new AssignedCategoryData { CategoryID = cat.ID, Name = cat.CategoryName, Assigned = albumCategories.Contains(cat.ID) }); } }
public void UpdateAlbumCategories(Vaida_Sabina_ProiectContext context, string[] selectedCategories, Album albumToUpdate) { if (selectedCategories == null) { albumToUpdate.AlbumCategories = new List <AlbumCategory>(); return; } var selectedCategoriesHS = new HashSet <string>(selectedCategories); var albumCategories = new HashSet <int>(albumToUpdate.AlbumCategories.Select(c => c.Category.ID)); foreach (var cat in context.Category) { if (selectedCategoriesHS.Contains(cat.ID.ToString())) { if (!albumCategories.Contains(cat.ID)) { albumToUpdate.AlbumCategories.Add( new AlbumCategory { AlbumID = albumToUpdate.ID, CategoryID = cat.ID }); } } else { if (albumCategories.Contains(cat.ID)) { AlbumCategory courseToRemove = albumToUpdate .AlbumCategories .SingleOrDefault(i => i.CategoryID == cat.ID); context.Remove(courseToRemove); } } } }